• 제목/요약/키워드: University of British Columbia

검색결과 275건 처리시간 0.042초

Degradation of 1,4-Dioxane using $O_3$/$H_2O_2$

  • Suh, Jung-Ho;Mohseni, Madjld
    • 한국환경과학회:학술대회논문집
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    • 한국환경과학회 2003년도 International Symposium on Clean Environment
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    • pp.139-144
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    • 2003
  • 1, 4-dioxane is a recalcitrant pollutant found in contaminated ground waters and industrial effluents. Conventional water treatment techniques are limited to treat this compound effectively. In this study, $O_3$$H_2O_2$ oxidation process was used to eliminate 1, 4-dioxane in water and to enhance the biodegradability. Several factors affecting biodegradability enhancement were investigated. The relationship between initial oxidation rate of 1 A-dioxane and BOD enhancement rate has been determined, a kinetic model has been proposed. $H_2O_2$ concentration and pH had a proportional relation with biodegradability of 1, 4-dioxane, but in case of ozone, there was no relationship with biodegradability. 1, 4-Dioxane removal efficiencies had good agreement with the biodegradability.

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Synthesis of Octopus Type Trimethylene Glycol β-D-glucopyranosides

  • Kim, Yong Sik;Kadla, John F.
    • Journal of the Korean Wood Science and Technology
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    • 제41권2호
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    • pp.149-157
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    • 2013
  • The octopus type oligo-hydroxypropylene glycol ${\beta}$-D-glucopyranosides were successfully synthesized in this studies: the sterospecific compound of allyl 2, 3, 4, 6-tetra-O-acetyl-${\beta}$-D-glucopyranosides (1) was deacetylated with NaOMe in MeOH lead to allyl-${\beta}$-D-glucopyranoside (2) which was perallylated and followed by hydroboration and subsequent oxidation afforded (3-hydroxy-propyl) 2, 3, 4, 6-tetraO(3-hydroxy-propyl)-${\beta}$-D-glucopyranoside (4). As a result, not only allylpropylene glycol ${\beta}$-D-glucopyranosides (5, 7, and 9) but also hydroxypropylene glycol ${\beta}$-D-glucopyranosides (6, 8, and 10) were synthesized by repeated sequential perallylation followed by hydroboration/oxidation.

Chronic Obstructive Pulmonary Disease and the Airway Microbiome: What Respirologists Need to Know

  • Don D. Sin
    • Tuberculosis and Respiratory Diseases
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    • 제86권3호
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    • pp.166-175
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    • 2023
  • Chronic obstructive pulmonary disease (COPD) is a leading cause of morbidity and mortality worldwide. The lower airways contain a rich and diverse microbiome, which may play a significant regulatory role in both health and disease. In COPD, the microbiome becomes perturbed, causing dysbiosis. Increased representation of members in the Proteobacteria phylum and certain members in the Firmicutes phylum has been associated with increased risk of exacerbations and mortality. Therapies such as inhaled corticosteroids and azithromycin may modulate the airway microbiome or its metabolites in patients with COPD. This paper provides an up-to-date overview of the airway microbiome and its importance in the pathophysiology of COPD and as potential therapeutic target in the future.

What Single Cell RNA Sequencing Has Taught Us about Chronic Obstructive Pulmonary Disease

  • Don D. Sin
    • Tuberculosis and Respiratory Diseases
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    • 제87권3호
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    • pp.252-260
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    • 2024
  • Chronic obstructive pulmonary disease (COPD) affects close to 400 million people worldwide and is the 3rd leading cause of mortality. It is a heterogeneous disorder with multiple endophenotypes, each driven by specific molecular networks and processes. Therapeutic discovery in COPD has lagged behind other disease areas owing to a lack of understanding of its pathobiology and scarcity of biomarkers to guide therapies. Single cell RNA sequencing (scRNA-seq) is a powerful new tool to identify important cellular and molecular networks that play a crucial role in disease pathogenesis. This paper provides an overview of the scRNA-seq technology and its application in COPD and the lessons learned to date from scRNA-seq experiments in COPD.

Plunge Milling Force Model using Instantaneous Cutting Force Coefficients

  • Ko Jeong-Hoon
    • International Journal of Precision Engineering and Manufacturing
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    • 제7권3호
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    • pp.8-13
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    • 2006
  • Plunge milling process is used for machining hole and is widely used in aerospace, automobile, and die/mold industries. The cutter is fed in the direction of spindle axis which has the highest structural rigidity. The kinematics of plunge milling differs from the traditional turning and milling in aspect of tool engagement and chip generation. This paper proposes the mechanistic cutting force model for plunge milling. Uncut chip thickness is calculated using the present cutter edge position and the previous cutter edge position. Instantaneous cutting force coefficients, which depend only on instantaneous uncut chip thickness, are derived based on the mechanistic approach. The developed cutting force model is verified through comparison of the predicted and the measured cutting forces.

Mechanisms of Competition betxeen Canopy-Forming and Turf-Forming Intertidal Algae

  • Kim, Jeong-Ha
    • ALGAE
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    • 제17권1호
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    • pp.33-39
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    • 2002
  • Mechanisms of competition between two canopy algae and an understory alga were investigated by a field manipulative experiment using artificial thalli. The study was carried out in the upper intertidal zone at Nudibranch Point in Vancouver Island, British Columbia, Canada, where two fucoids, Fucus gardneri and Pelvetiopsis limitata, and a turf red alga, Mazzaella cornucopiae, were dominant in the algal community. The experiment was designed to test three hypotheses, shading, whiplash, and allelopathy, imposed by potential fucoid effects on M. cornucopiae. Only the shading effect was significant, indicating that adult fucoid thalli reduced. M. cornucopiae biomass underneath the fucoids. Results indicated that reversal of competitive dominance existed between F. gardneri and M. cornucopiae depending on the life history stage of the competitors. By including the turf alga's effects on the fucoids, the well-balanced and non-hierarchical interaction networks among the major macroalgae support the high likelihood of species coexistence in the community.

캐나다의 건강증진 (Health Promotion in Canada)

  • George, Anne
    • 한국보건교육건강증진학회:학술대회논문집
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    • 한국보건교육건강증진학회 2001년도 제4회 국제학술 심포지움
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    • pp.81-89
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    • 2001
  • 캐나다는 건강증진분야를 개발하는데 오랜 역사를 가지고 있다. 건강증진을 국가적인 전략으로 확인하는 최초의 정치적 문서가 1974년 정부보고서로 발간되었다. 건강증진에 관한 최초의 국제회의가 1986년 오타와(Otawa)에서 열렸으며 건강증진에 대한 획기적인 오타와헌장(Otawa Charter)이 선언되었다. 이론적인 개발의 촛점은 개인의 생활과 행태로부터 사회적 함의로 옮아 갔으며 이제 건강의 불균형에 대한 사회적 책임을 인식하게 되었다. 캐나다 국가와 주정부는 건강증진의 개발에 선두 주자였으나 건강증진의 실천은 지방의 지역사회 수준에서 가장 잘 계획되고 실행되어 왔다. 캐나다에서 건강증진의 다른 중요한 측면은 석사와 박사 수준의 훈련과정을 대학에서 실시하고 있다는 것이며, 캐나다의 새로운 국가연구기금조직은 인구의 건강과 건강증진의 개발을 포함하는 연구비를 신청하기를 기대한다.

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북미의 해양교육 연구 30년, 그 방법론에 대한 고찰 (30 Years of Marine Educational Research in North America: A Review of Methodologies)

  • 김종문
    • 수산해양교육연구
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    • 제24권6호
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    • pp.950-962
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    • 2012
  • 인류의 해양에 대한 의존도가 점차 높아지면서 해양과 인류의 관계를 이해하고 이를 통해 해양의 지속가능성을 유지하기 위한 해양교육은 외국뿐만 아니라 국내에서도 더욱 활발하게 진행되어 가는 추세이다. 북미의 경우 해양교육의 증가에 비례하여 해양교육에 대한 연구도 양적으로 급격히 증가하였음은 물론이고 그 방법 또한 매우 다양하게 이루어지고 있다. 연구란 연구자가 가진 패러다임, 존재론, 인식론을 기반으로 이루어지므로 이에 대해 개략적으로 고찰한 뒤 양적, 질적, 혼합 방법론이 지닌 장점과 제한점을 논의한다. 해양교육과 관련된 북미의 연구논문들(1980년~ 2011년)을 대상으로 연구자들이 사용한 다양한 연구방법 및 디자인을 연구사례와 함께 소개하여 한국에서의 해양교육 연구 설계를 위한 참고자료를 제공한다.

Taoism in Korea, Past and Present

  • Baker, Donald
    • 대순사상논총
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    • 제16권
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    • pp.241-263
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    • 2003
  • 조선 시대 중기에 한국은 도교의 내단에 흥미가 고조되는 것을 체험했고, 16~17세기 중에 많은 유교 학자들이 받아들인 호흡법과 심신 수련은 이미 초기 중국에서 고안된 심신 수련자의 신체에서 나오는 기의 순환과 양·질을 강화하는 것이었다. 그러나 18~19세기의 한국인들은 이러한 양생법에 대해서 흥미를 잃게 되지만, 20세기의 지난 반세기 동안에 내단을 이채롭게 다시 부흥시킨 것이다. 여러 가지 새로운 조직체들이 단전호흡과 도인체조를 서울과 다른 도시에서 증진 시키고 있다. 국선도가 1970년에 처음으로 시행되었고 이것은 1984년 새로운 내단으로 되기까지 대중들의 호응을 받지 못했다. 그러나 이러한 심신수련이 새 조직인 단(丹)세계에 의해서 멀리 번창되어 나갔으며 이 조직의 지도자인 이 승훈에 의해서 흥미롭게 다시 소생되었다. 단 세계는 한국에서 무려 360개가 넘는 선원이 있으며 수련자들에 의해서 유럽과 북미에서도 선원이 시작되었다. 이것은 근본적으로 중국의 도교 보다는 고조선 시대 단군에 의해서 고안된 것이라고 말한다. 단 세계는 도교적 양생법 수련보다 한국의 전통적인 것에 대한 자부심을 가지고 장려되고 있다.

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Symplocarpus koreanus (Araceae; Orontioideae), a new species based on morphological and molecular data

  • LEE, Joon Seon;KIM, Seon-Hee;KIM, Yongsung;KWON, Youl;YANG, JiYoung;CHO, Myong-Suk;KIM, Hye-Been;LEE, Sangryong;MAKI, Masayuki;KIM, Seung-Chul
    • 식물분류학회지
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    • 제51권1호
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    • pp.1-9
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    • 2021
  • Symplocarpus koreanus (Araceae; Orontioideae) from Korea is described as new. Symplocarpus koreanus has long been considered to be conspecific with S. renifolius in Japan, but phylogenetic, morphological, and cytological data indicate its taxonomic distinction. Compared to S. renifolius, S. koreanus has a much smaller spathe and more spherical spadix with fewer, smaller flowers. Previous phylogenetic studies also suggested that S. koreanus is more closely related to nonthermogenic S. nipponicus than to S. renifolius in Japan. Like its nonthermogenic sister species, S. nipponicus, in Korea and Japan, S. koreanus is diploid (2n = 2x = 30), while S. renifolius in Japan is tetraploid (2n = 4x = 60). A detailed species description, geographical distribution, major morphological differences between the species and a dichotomous key to the species in eastern Asia are provided.